<template>
  <div id="app">
    <el-card shadow="always">
      <el-form :inline="true" size="medium" :model="studentSearch" class="demo-form-inline">
        <!--条件查询-->
        <el-form-item>
          <el-input v-model="studentSearch.sname" placeholder="学生姓名"></el-input>
        </el-form-item>
        <el-form-item>
          <el-input v-model="studentSearch.addr" placeholder="学生住址"></el-input>
        </el-form-item>
        <el-form-item>
          <el-select v-model="studentSearch.cid" placeholder="所在班级">
            <el-option label="所有班级" value="0"></el-option>
            <el-option :label="c.cname" :value="c.cid" v-for="c in classesList" :key="c.cid"></el-option>
          </el-select>
        </el-form-item>
        <el-form-item>
          <el-button type="primary" icon="el-icon-search" plain @click="search">查询</el-button>
        </el-form-item>
        <el-form-item>
          <el-button type="success" icon="el-icon-plus" plain @click="addStudent">添加学生</el-button>
        </el-form-item>
        <el-form-item>
          <el-button type="danger" icon="el-icon-remove" plain @click="handleDelete">批量删除</el-button>
        </el-form-item>
      </el-form>
      <el-table
          :data="studentList"
          style="width: 100%"
          @selection-change="handleSelectionChange">
        <el-table-column
            type="selection"
            width="55">
        </el-table-column>

        <el-table-column
            label="学号"
            align="center"
            prop="sid"
            width="180"/>
        <el-table-column
            label="姓名"
            prop="sname"
            align="center"/>
        <el-table-column
            label="性别"
            prop="sex"
            align="center"/>
        <el-table-column
            label="年龄"
            prop="age"
            align="center"/>
        <el-table-column
            label="住址"
            prop="addr"
            align="center"/>
        <el-table-column
            label="所在班级"
            prop="cname"
            align="center"/>
        <el-table-column label="操作" align="center">
          <template slot-scope="scope">
            <el-button
                size="mini"
                @click="handleEdit(scope.$index, scope.row)">编辑</el-button>
            <el-button
                size="mini"
                type="danger"
                @click="handleDelete(scope.$index, scope.row)">删除</el-button>
          </template>
        </el-table-column>
      </el-table>
      <!--分页导航面板-->
      <el-pagination
          @size-change="handleSizeChange"
          @current-change="handleCurrentChange"
          :current-page="page"
          :page-sizes="[5, 10, 15, 20]"
          :page-size="pageSize"
          layout="total, sizes, prev, pager, next, jumper"
          :total="total">
      </el-pagination>
    </el-card>
    <!--编辑【添加/修改】学生对话框-->
    <el-dialog :title="title" :visible.sync="dialogFormVisible" :close-on-click-modal="false">
      {{student}}
      <el-form :model="student" :rules="rules" ref="ruleForm">
        <el-form-item label="学生姓名" prop="sname" :label-width="formLabelWidth">
          <el-input v-model="student.sname" autocomplete="off"></el-input>
        </el-form-item>
        <el-form-item label="学生性别" prop="sex" :label-width="formLabelWidth">
          <el-radio v-model="student.sex" label="男">男</el-radio>  <!--单选框-->
          <el-radio v-model="student.sex" label="女">女</el-radio>
        </el-form-item>
        <el-form-item label="学生年龄" prop="age" :label-width="formLabelWidth">
          <el-input v-model.number="student.age" autocomplete="off"></el-input>
        </el-form-item>
        <el-form-item label="家庭住址" prop="addr" :label-width="formLabelWidth">
          <el-input v-model="student.addr" autocomplete="off"></el-input>
        </el-form-item>

        <el-form-item label="所在班级" prop="cid" :label-width="formLabelWidth">
          <el-select v-model="student.cid" placeholder="请选择所在班级">
            <el-option label="所有班级" value="0"></el-option>
            <el-option :label="c.cname" :value="c.cid" v-for="c in classesList" :key="c.cid"></el-option>
          </el-select>
        </el-form-item>
      </el-form>
      <div slot="footer" class="dialog-footer">
        <el-button @click="dialogFormVisible = false">取 消</el-button>
        <el-button type="primary" @click="saveStudent">保 存</el-button>
      </div>
    </el-dialog>
  </div>
</template>

<script>
import studentApi from "@/api/student"
import classesApi from "@/api/classes"

export default {
  data() {
    // 自定义校验规则
    let checkAge = (rule, value, callback) => {
      if (value === '' || value == null) {
        return callback(new Error('年龄不能为空'))
      } else if (!Number.isInteger(value)) {
        return callback(new Error('年龄必须为整数值'))
      } else if (value < 1 || value > 200) {
        return callback(new Error('年龄必须在1-200之间'))
      } else {
        callback()
      }
    }
    return {
      studentList: [],
      page: 1,        // 当前页
      pageSize: 5,    // 每页显示记录条数
      total: 100,     // 总记录数
      studentSearch: {}, // 条件查询对象
      classesList: [],   // 所有班级
      dialogFormVisible: false,  // 代表对话框的显示状态
      student:{},//代表添加或修改的学生对象
      title:"添加学生",//对话框标题
      formLabelWidth:"120px",//表单的标签宽度
      multipleSelection:[],//选中项
      sids:[],//删除的学生编号
      //定义校验规则
      rules:{
        sname: [//学生姓名
          {require:true , message:"请输入学生姓名", trigger:"blur"},
          //{min:2,max:10,message: "长度在2到10个字符",trigger:"blur"},
        ],
        sex: [ //校验学生性别
          {required: true, message: "请选择性别", trigger: "blur"},
        ],
        age: [//  校验学生年龄
           //{ required: true, message: '请输入学生年龄', trigger: 'blur' },
          // 使用自定义验证规则验证年龄
          { validator : checkAge, trigger: 'blur'}
        ],
        addr: [//  校验学生住址
          {required: true, message: '请输入学生住址', trigger: 'blur'},
        ],
        cid: [ //  校验学生班级
          {required: true, message: '请选择学生班级', trigger: 'blur'},
        ]
      }
    }
  },
  created() {
    //this.findStudents()
    this.search()
    //this.findByPage()
    this.findAllClasses()
  },
  methods: {
    async findStudents() {//所有学生
      try {
        const { data: res } = await studentApi.findAllStudents()
        //console.log(res)
        if (res.code === 200) {
          this.studentList = res.data.list
        }
      } catch (error) {
        console.error("查询所有学生失败:", error)
      }
    },
    async findByPage() {//分页功能
      const {data:res} = await studentApi.findByPage(this.page,this.pageSize)
      console.log(res)
      if (res.code === 200) {
        this.studentList = res.data.list.rows
        this.total = res.data.list.total
      }
    },
    async findAllClasses() {//所有班级
      try {
        const { data: res } = await classesApi.findAllClasses()
        console.log(res)
        if (res.code === 200) {
          this.classesList = res.data.list
        }
      } catch (error) {
        console.error("查询所有班级失败:", error)
      }
    },
    async search() {//条件查询学生并实现分页功能
      try {
        const { data: res } = await studentApi.search(this.page, this.pageSize, this.studentSearch)
        console.log(res)
        if (res.code === 200) {
          this.studentList = res.data.list.rows
          this.total = res.data.list.total
        }
      } catch (error) {
        console.error("条件查询失败:", error)
      }
    },
    addStudent() {//添加学生
      this.title="添加学生"
      this.student={}

      this.dialogFormVisible = true
    },
    saveStudent() {//保存学生
      this.$refs.ruleForm.validate(async valid=> {
        //根据是否有sid来决定添加还是修改，没有sid就是添加，有就是修改
        let url = "/student/add"      // 默认地址是添加学生
        let method = "post"           // 添加是post请求
        if(this.student.sid){
          url = "/student/update"    // 如果有值就改为修改学生
          method = "put"             // 修改是put请求
        }
        //执行添加或修改
        if (valid) {
          const {data:res} = await studentApi.save(url,method,this.student)
          console.log("res:",res)
          if (res.code === 200) {     // 后端执行成功返回200
            this.$message({
              type: 'success',
              message: res.message,
              onClose: () => {        // 关闭对话框时的回调
                // 6.3 关闭对话框
                this.dialogFormVisible = false
                // 6.4 重新查询
                this.search()
              }
            })
          }else{                      // 后端执行失败返回500
            this.$message({
              type: 'error',
              message: res.message,
              
            })
          }
        }else{
          console.log("验证失败")
          return false
        }
      })
    },
    handleSelectionChange(val) {
      this.multipleSelection = val
      console.log(this.multipleSelection)
    },
    handleSizeChange(val) {
      this.pageSize = val
      this.search()
      //this.findByPage()
      console.log(`每页 ${val} 条`);
    },
    handleCurrentChange(val) {
      this.page = val
      this.search()
      //this.findByPage()
      console.log(`当前页: ${val}`);
    },
    handleEdit(index, row) {//编辑学生
      //打开对话框
      this.title = "修改学生信息"
      //显示学生数据
      this.student = row
      this.dialogFormVisible = true
      console.log(index, row);
    },
    handleDelete(index, row) {//删除学生，单个或者批量的
      this.sids=[]
      if(row){
        this.sids.push(row.sid);
      }else {
        this.sids=this.multipleSelection.map(m=>m.sid)
      }
      this.$confirm(`是否删除学号为${this.sids}的学生`, '提示', {
        confirmButtonText: '确定',
        cancelButtonText: '取消',
        type: 'warning'
      }).then(() => {//点击确定后执行
        let _this = this
        studentApi.delete(this.sids)
            .then(({data:res}) => {
              console.log("res:",res)
              if (res.code === 200) {
                this.$message({
                  type: 'success',
                  message: res.message,
                  onClose: () => {
                    // 重新加载数据
                    _this.search()
                  }
                })
              } else {
                this.$message({
                  type: 'error',
                  message: res.message
                })
              }
            })
      }).catch(() => {//点击取消
        this.$message({
          type: 'info',
          message: '已取消删除'
        });
      });
       console.log("sids:",this.sids);
       console.log(index, row);
    }
  }
}
</script>

<style>
#app {
  display: flex;
  justify-content: center;
}
.el-card {
  width: 90%;
}
.el-pagination {
  margin-top: 20px;
  text-align: right;
}
</style>
